Maybe the earphones jack is stuck (behave like earphones are plugged in). Have you tried plug in and out the earphones several times to see if it resolve the problem?

>My daughter's been listening to videos with the earphones on. All speaker settings are on, volume up, device mgr says all working properly, etc. But I can't get any sound out of my PC.
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>Any ideas? Something I might have inadvertently set? Circuits burnt out?
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>Baffled.
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>'ppreciate it.